50ab5d638a
sched/task: It is not appropriate for logic in task_exit() to call the new version of this_task(). sched/irq: Remove redundant fetch of CPU index; configs/sabre-6qguad: update README.
2018-02-06 19:06:33 -06:00
0ba7853016
sched/irq: Fix a infinite recursion problem that a recent change introduced into the i.MX6 SMP implementation.
2018-02-06 09:18:03 -06:00
56bb76caca
sched/irq: Fix an error in a assertion introduced in commit 37c9b3d54a. Noted by Masayuki Ishikawa.
2018-02-05 21:13:42 -06:00
b884fb9fed
sched/sched: Extend the last global lock change to work with the lc823450-xgevk which does not support the atomic fetch add but does support disabling interprocessor interrupts. Disabling interprocessor interrupts will also guarantee that the TCB addres calculation is atomic.
2018-02-05 13:32:09 -06:00
37c9b3d54a
sched/sched: Implements a global scheduler lock capability as part of SMP support. This allows the scheduler to be locked with no knowledge or access to the TCB of the currently running task. This is necessary because accessing the TCB of the currenlty running task is, itself, a non-atomic operation. This global scheduler lock cpability was add just to support that atomic access to the TCB.
2018-02-05 13:12:36 -06:00
5beab6fbf0
spin_lock_irqsave() and spin_unlock_irqrestore() are only valid if the CPU supports global disabling of interrupts.
2018-02-04 15:41:22 -06:00
fad70bf90e
Update some comments
2018-02-03 09:35:46 -06:00
7cf88d7dbd
Make sure that labeling is used consistently in all function headers.
2018-02-01 10:00:02 -06:00
12e3e47d3c
Update comments, mostly spelling errors.
2018-01-27 09:37:46 -06:00
0080225473
sched/irq: Add a configuration option to show interrupt information via a procfs file.
2018-01-12 18:26:46 -06:00
b2adb4917f
arch/arm/src/lpc54xx: Add register level debug output for Ethernet testing. Fixed a few start up problems. Still hangs on start-up, however.
2017-12-31 11:11:57 -06:00
6150299f54
Merged in masayuki2009/nuttx.nuttx/irq_spinlock (pull request #550 )
...
SMP: Introduce spin_lock_irqsave() and spin_unlock_irqrestore()
These APIs are simplified version of enter_critical_section() and
leave_critical_section() to protect data (e.g. registers) in SMP mode.
By using these APIs inside drivers, performace will be improved.
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
Approved-by: Gregory Nutt <gnutt@nuttx.org>
2017-12-07 19:39:04 +00:00
b274a97840
Miscellaneous fixes from astyle tool.
2017-08-14 17:19:27 -06:00
dffb8a67e3
Add entropy pool and strong random number generator
...
Entropy pool gathers environmental noise from device drivers, user-space, etc., and returns good random numbers, suitable for cryptographic use. Based on entropy pool design from *BSDs and uses BLAKE2Xs algorithm for CSPRNG output.
Patch also adds /dev/urandom support for using entropy pool RNG and new 'getrandom' system call for getting randomness without file-descriptor usage (thus avoiding file-descriptor exhaustion attacks). The 'getrandom' interface is similar as 'getentropy' and 'getrandom' available on OpenBSD and Linux respectively.
2017-03-30 07:38:37 -06:00
e1218c4b4b
Smaller vector tables: Add irq_mapped_t.
2017-03-03 10:20:40 -06:00
c2b620b4f8
Implements support for smaller interrupt tables as described at http://www.nuttx.org/doku.php?id=wiki:howtos:smallvectors . This is largely the work of Mark Schulte. However, I have made several changes to match with the Wiki document. If you like the change, thanks go to Marc. For any errors you can blame me.
2017-03-03 09:20:25 -06:00
02b1e1ec1a
Fixes for coding standard: '*' needs to 'snuggle' with following variable name
2017-02-28 18:22:57 -06:00
840c5935a3
Correct a typo from one of the preceding commits.
2017-02-27 11:58:20 -06:00
b3222bbc8a
irq_dispatch: Add argument pointer to irq_dispatch
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Provide a user defined callback context for irq's, such that when
registering a callback users can provide a pointer that will get
passed back when the isr is called.
2017-02-27 06:27:56 -06:00
9ce4022096
SMP: Fix an error in critical section logic when performing a context switch from an interrupt handler. The g_cpu_irqset bit was not being set for the CPU so other CPUs did not know about the critical section.
2017-01-13 06:48:10 -06:00
e7d2b9f0e8
SMP: Move sharable function to common file as irq_cpu_locked(). Use irq_cpu_locked() in sched_unlock()
2016-12-29 08:17:10 -06:00
96394f339e
SMP: Fix a gap where we may try to make modifications to the task lists without being in a critical sections. That permits concurrent access to the tasks lists and many subtle problems. This fix just remains in the critical section throughout the operation (and possible until the task is restore in the event of a context switch). Makes a big difference in stability
2016-12-28 13:58:24 -06:00
849a5dc2a9
SMP: Enforce this rule: Tasks which are normally restored when sched_unlock() is called must remain pending (1) if we are in a critical section, i.e., g_cpu_irqlock is locked , or (2) other CPUs still have pre-emption disabled, i.e., g_cpu_schedlock is locked. In those cases, the release of the pending tasks must be deferred until those conditions are met.
2016-12-26 08:15:02 -06:00
d45a81d643
Revert "SMP: Fix a error introduced in 36b676eea6 and fully decouple disabling of pre-emption from critical sections."
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This reverts commit 9aedf1bdec
2016-12-26 07:48:22 -06:00
9aedf1bdec
SMP: Fix a error introduced in 36b676eea6 and fully decouple disabling of pre-emption from critical sections.
2016-12-25 06:54:43 -06:00
efb86382c3
SMP: Back out deferred IRQ locking. This was accidentally merged into master and it looks like it is going to be more work than I thought to get it working again. Changes will go to the irqlock branch.
2016-12-24 19:53:37 -06:00
f55bad863b
SMP: Fix logic error in last change: Deferred restoration of IRQ lock only applies if the context switch was on this CPU.
2016-12-24 18:52:58 -06:00
d75a7643d0
Fix a trivial typo
2016-12-23 13:01:20 -06:00
e6fff09ef8
Implement deferred IRQ locking. So far only form ARMv7-M.
2016-12-23 07:55:41 -06:00
9ed0387379
Olimex-LPC1766-STK: Enable procfs in NSH configuration. Automount /proc on startup.
2016-12-05 08:52:40 -06:00
00215fbc98
sched_note: Add spinlock instrumentation; In SMP configurations, select to log only notes from certain CPUs
2016-11-28 10:33:46 -06:00
e3fe320e08
SMP: Add support for linking spinlocks into a special, non-cached memory region.
2016-11-26 08:47:03 -06:00
1d06e786e1
SMP: Clean-up and simplication of logic that I implemented late last night.
2016-11-26 07:05:27 -06:00
a0e1af2614
SMP: Fix yet another potential deadlock
2016-11-25 23:04:27 -06:00
7bec4ffeec
Update some comments
2016-11-23 17:40:01 -06:00
f90525a5d1
SMP: Update some comments; trivial improvement by inlining static function.
2016-11-22 16:48:57 -06:00
bac7153609
SMP: Add logic to avoid a deadlock condition when CPU1 is hung waiting for g_cpu_irqlock and CPU0 is waitin for g_cpu_paused
2016-11-22 11:34:16 -06:00
69e9f8638d
Most interrupt handling logic interacts with tasks via standard mechanism such as sem_post, sigqueue, mq_send, etc. This all call enter_critical_section and are assumed to be safe in the SMP case.
...
But certain logic interacts with tasks in different ways. The only one that comes to mind are wdogs. There is a tasking interface that to manipulate wdogs, and a different interface in the timer interrupt handling logic to manage wdog expirations.
In the normal case, this is fine. Since the tasking level code calls enter_critical_section, interrupts are disabled an no conflicts can occur. But that may not be the case in the SMP case. Most architectures do not permit disabling interrupts on other CPUs so enter_critical_section must work differently: Locks are required to protect code.
So this change adds locking (via enter_critical section) to wdog expiration logic for the the case if the SMP configuration.
2016-11-18 13:57:30 -06:00
78fd358023
Update some comments.
2016-11-18 08:20:52 -06:00
8602e8a8a9
SMP: irq_csection() has a bad assumption. It assumed that the state of certain variables. That was true on entry into the interrupt handler, but might change to the execution of logic within the interrupt handler.
2016-11-18 07:38:16 -06:00
8e029f019b
Update comments
2016-11-17 17:30:12 -06:00
47b52a2633
Fix an error in manually bringing in Sebastien's changes; Update some comments.
2016-11-17 16:15:06 -06:00
9acd57c819
Fix up some naming and update some comments.
2016-11-17 15:50:39 -06:00
558f4049d4
sched/irq/irq_csection: Fix a bad DEBUG assertion when SMP is enabled.
2016-11-17 15:36:27 -06:00
2c314464a8
Fix a typo in a comment
2016-11-17 08:03:45 -06:00
ccdc11d8ff
Fix typo in variable naming. g_cpu_irqset should be g_cpu_irqlock.
2016-11-17 06:37:24 -06:00
1c1564f0c1
Add logic to handled nested calls to enter_critical_section() from interrupts handlers (with SMP).
2016-11-16 22:45:08 -06:00
0c3207e86e
Fix backward logic in an assertion.
2016-11-16 21:48:27 -06:00
16f0b8fa96
Fix typos in DEBUASSERT statements
2016-11-16 19:58:51 -06:00
f1e4951a8d
Fix some comments
2016-11-16 19:11:31 -06:00
Gregory Nutt